<!DOCTYPE html>
<html lang="en">
<head>
    <style>
        * {
            writing-mode: horizontal-tb;
        }

        div {
            background-color: green;
            height: 200px;
            width: 300px;

            margin: 15px;

            border: 10px solid black;
        }
    </style>
</head>
<body>
  <div></div>
  <div></div>
  <div></div>
</body>
</html>
